Auto merge of #9475 - Nemo157:mod-files-remap, r=xFrednet

[rust.git] / src / main.rs

diff --git a/src/main.rs b/src/main.rs
index 240e233420f0ea124f063951cfa9973f5ac087d9..4a32e0e54a81b3fdbe579249771fb0c5123e14a2 100644 (file)
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,6 +7,8 @@
 use std::path::PathBuf;
 use std::process::{self, Command};
 
+mod docs;
+
 const CARGO_CLIPPY_HELP: &str = r#"Checks a package to catch common mistakes and improve your Rust code.
 
 Usage:
@@ -17,6 +19,7 @@
     --fix                    Automatically apply lint suggestions. This flag implies `--no-deps`
     -h, --help               Print this message
     -V, --version            Print version info and exit
+    --explain LINT           Print the documentation for a given lint
 
 Other options are the same as `cargo check`.
 
@@ -54,6 +57,16 @@ pub fn main() {
         return;
     }
 
+    if let Some(pos) = env::args().position(|a| a == "--explain") {
+        if let Some(mut lint) = env::args().nth(pos + 1) {
+            lint.make_ascii_lowercase();
+            docs::explain(&lint.strip_prefix("clippy::").unwrap_or(&lint).replace('-', "_"));
+        } else {
+            show_help();
+        }
+        return;
+    }
+
     if let Err(code) = process(env::args().skip(2)) {
         process::exit(code);
     }
@@ -123,8 +136,12 @@ fn into_std_cmd(self) -> Command {
             .map(|arg| format!("{}__CLIPPY_HACKERY__", arg))
             .collect();
 
+        // Currently, `CLIPPY_TERMINAL_WIDTH` is used only to format "unknown field" error messages.
+        let terminal_width = termize::dimensions().map_or(0, |(w, _)| w);
+
         cmd.env("RUSTC_WORKSPACE_WRAPPER", Self::path())
             .env("CLIPPY_ARGS", clippy_args)
+            .env("CLIPPY_TERMINAL_WIDTH", terminal_width.to_string())
             .arg(self.cargo_subcommand)
             .args(&self.args);